Nobuo Uematsu VS Yasunori Mitsuda

[The Man]

I can't say I prefer one over the other in terms of quality, but I'd have to give the nod to Nobuo just for the sheer volume of his output. Though if I had to rank game soundtracks, Chrono Cross and Chrono Trigger would be at or near the top. (Then again, so would FFVI and FFIX).